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The Rotifer Fauna of Guatemala and Belize: Survey and Biogeographical Affinities

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The Rotifer Fauna of Guatemala and Belize: Survey and Biogeographical Affinities The Rotifer fauna of Guatemala and Belize: survey and biogeographical affinities Alma Estrella García-Morales & Manuel Elías-Gutiérrez El Colegio de la Frontera Sur. Av. Centenario km 5.5 Chetumal 77900, Quintana Roo, México; [email protected] Received 11-XII-2001. Corrected 30-VIII-2006. Accepted 15-XII-2006. Abstract: Rotifer samples were obtained from 29 localities in northern Guatemala and central-southern Belize during March 2000 and June 2001. A total of 119 species were identified. Ten selected taxa are illustrated and commented: Euchlanis semicarinata, Lepadella apsicora, L. cryphaea, Lecane curvicornis f. lofuana, L. whitfordi, Monommata maculata, Scaridium bostjani, Trichocerca elongata f. braziliensis, and T. hollaerti. The species Lepadella rhomboidula is a first record for the American Continent. The species are 71 % cosmopolitan, 6 % tropicopolitan, and 4.2 % restricted to the subtropics. The Guatemala species number range was Petén-Itza lake (53 taxa), and Raxruja pool (three). La Democracia pool (49 taxa), and the Blue Hole sink-hole (six spe- cies) were the extremes in Belize. In total, 68 of the recorded taxa are new for Guatemala and 91 for Belize. Additionally, 47 species are registered by the first time in Central America. A comparison between these two countries and Mexico revealed that the south part of the latter conform a cluster with them, emphasizing the transitional character of this region between the Nearctics and the Neotropics. Furthermore, Guatemala and Belize have differences in species assemblages, as a response to the nature of their particular environments and topographical accidents. Rev. Biol. Trop. 55 (2): 569-584. Epub 2007 June, 29. Key words: rotifera, taxonomy, diversity, distribution, Guatemala, Belize. In Central America, studies on taxonomy Elías-Gutiérrez (2004) recorded 128 species and distribution of rotifers are relatively scarce from 36 localities in the south of Mexico. A and old (ie. Collado et al. 1984). Currently, previous study by Sarma and Elías-Gutiérrez knowledge on the rotifer fauna of Guatemala is (1999a) in 12 localities from Yucatan rendered poor compared with North and South America 102 species. In both papers, a total of 37 new (Koste and De Paggi 1982, De Paggi and records for the region were figured, majority Koste 1995, Segers 1997, Sarma 1999, Sarma of them regarded as warm-stenotherm (García- and Elías-Gutiérrez 1999a, b, García-Morales Morales and Elías-Gutiérrez 2004). and Elías-Gutiérrez 2004). On the other hand, North of Guatemala and Belize possess Belize’s fauna is completely unknown; there highly contrasting environments due to topo- are no previous reports on the rotifers from graphic accidents, quite different with the this country. Lately, a preliminary study on homogeneous adjacent south of Yucatan Cladoceran fauna published by Elías-Gutiérrez Peninsula. Nevertheless, all of them belong to et al. (2006), emphasized about the diverse the same biotic province, named Campechano- aquatic systems found in this region, and the Petenense (UNAM 1990). As a result of the effect on their fauna. In case of rotifers, recent presence of mountain systems (for example publications are limited to the Mexican side, Mayan mountains in Belize and Sierra Chinajá close to both countries. García-Morales and in north of Guatemala) and other topographic Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 55 (2): 569-584, June 2007 569 accidents, both countries have diverse micro- geographical coordinates, and environmental habitats reflected in the vegetation and aquatic data of each sampling site are resumed in Table systems. As a result, in the case of fish fauna for 1. Animals were sorted with a stereomicroscope example, 13 endemic species dwell in north of and identified using a compound microscope. Guatemala (Valdéz-Moreno et al. 2005). Many Identification of rotifers was made following of the aquatic systems from these regions still Koste 1978, Nogrady et al. 1995, Segers 1995, remain as pristine and non polluted environ- De Smet and Pourriot 1997, Nogrady and ments (Valdéz-Moreno et al. 2005, pers. obs.). Segers 2004. Also we consulted the Academy The aims of this study were to provide of Natural Sciences of Philadelphia database on data on the species of the rotifer fauna found rotifers (Jersabek et al. 2003). When needed, in zooplankton collections gathered in several animals were dissolved in a sodium hypoclo- freshwater bodies from Guatemala and Belize, rite solution to allow examination of trophi. to include a comment about the distribution of Information about varieties and forms is pro- these animals in both countries, and to compare vided because rotifer taxonomy is still under the species assemblage with adjacent Mexico. discussion. For example, former varieties have been recently proposed to be good species (ie. Sarma and Nandini 2002 proposed to consider MATERIALS AND METHODS macracanthus, a former variety of Brachionus patulus, as a different species). Selected new Rotifers were qualitatively collected using records in Central America were illustrated standard plankton net; 50 µm mesh size, attached by using a camera lucida. All material and to a handle in the littoral zone. Horizontal and original samples are deposited at the reference vertical tows, with the same kind of net were performed, when a limnetic zone (more than 5 m deep) was clearly defined in the surveyed water body. As a minimum, 200 l of water were filtered for each sample. After collections, mate- rial was preserved in 4 % formalin. At least five samples represented bigger systems, as Petén Lake, and the small puddles were characterized by one. Littoral sampling included all possible habitats for rotifers: submersed vegetation, bot- tom dwellers, etc. Temperature, depth, and Secchi transparency were measured at every site to give a reference about the environment where the rotifers dwell. In total, 11 localities were sampled in Guatemala and 18 from Belize (Fig. 1). Each place was visited once. Data on physical parameters and geographical coordi- nates of the studied sites are presented in Table Fig. 1. Guatemala and Belize with localities collected 1. In general, the surveyed systems are shallow (some of them were grouped due to their proximity). 1. (0.2-1.5 m depth), except for Petén-Itza Lake, Charco Seco; 2. Laguna and Estanque Crooked Tree; 3. the largest system. Transparency showed values Sand Hill; 4. La Democracia and Dos Charcos; 5. Charco ranging between 0.17-2 m, whereas tempera- Dos Puentes and Spanish Lockout I-III; 6. Blue Hole and ture had values between 23-37 °C, ranges also Caves Branch; 7. Pine Ridge I-III; 8. Río on Pools and Río Puente Largo; 9. Caracol; 10. Petén-Itza Lake; 11. Charco found in other surveys from the region (Sarma El Pato and Sayaxché; 12. Charco Raxruja, Río Candelaria, and Elías-Gutiérrez 1999a, García-Morales Charco Rayulia and Río San Simón; 13. Charco Sebol and and Elías-Gutiérrez 2004). Date of collection, Río Sebol; 14. Río Chajmaic and Río Dolores. 570 Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 55 (2): 569-584, June 2007 TABLE 1 Physical variables and location of the water bodies sampled Number Collecting Temperature Maximum Secchi Place Geographical coordinates of samples date (°C) depth (m) disk (m) GUATEMALA Latitude N Longitude W A Laguna Petén-Itza 16°55’44” 89°53’38” 5 21/03/00 30 40 2 B Sayaxché 16°12’33.6” 90°10’47.3” 1 18/05/01 32 1 0.25 C Charco Raxruja 15°53’29” 90°05’51” 1 27/03/00 29 0.39 0.39 D Río Candelaria 15°53’04” 90°11’12” 2 27/03/00 28 0.5 0.5 E Charco Sebol 15°40’25” 89°56’39” 3 23/03/00 26 0.8 0.8 F Río Sebol 15°40’25” 89°56’39” 2 22/03/00 ND 1 1 G Charco Río Chajmaic 15°43’15” 89°56’24” 1 23/03/00 23 0.4 0.4 H Río Dolores 15°44’17” 90°22’34” 3 26/03/00 26 0.5 0.5 I Charco Rayulia 15°54’41” 90°06’06” 1 27/03/00 29 1.17 1.17 J Río San Simón 15°50’39” 90°17’01” 1 25/03/00 25 0.25 0.25 K Charco del Pato 16°07’36” 90°10’53” 1 27/03/00 29 0.79 0.47 BELIZE L Charco Seco 17°55’31.5” 88°31’10” 1 14/06/01 36 0.2 0.2 M Charco Dos Puentes 17°13’27.6” 88°52’29.2” 1 14/06/01 34 1.5 1.5 N Spanish Lokcout I 17°13’54.1” 88°55’49.2” 1 14/06/01 36 0.2 0.2 Ñ Spanish Lokcout II 17°13’59.4” 88°56’04.4” 1 14/06/01 35 0.55 0.41 O Spanish Lokcout III 17°14’17.1” 88°56’49.3” 1 14/06/01 37 0.2 0.2 P Pine Ridge I 17°02’55.6” 88°56’57.8” 1 15/06/01 25.5 0.56 0.56 Q Pine Ridge II 17°03’04.9” 88°57’17.5” 1 15/06/01 25 0.33 0.33 R Pine Ridge III 17°02’56.1” 88°57’03.1” 1 15/06/01 26 0.4 0.4 S Caracol 16°45’34.1” 89°07’13.7” 1 15/06/01 28 0.5 0.28 T Laguna Crooked Tree 17°46’30.4” 88°31’51.5” 2 16/06/01 30 0.7 0.7 U Estanque Crooked Tree 17°46’24.7” 88°30’54.8” 1 16/06/01 32 0.73 0.73 V Blue Hole 17°09’26.6” 88°41’00.6” 2 16/06/01 25 0.56 0.56 W Rio on Pools 16°59’16.6” 88°58’40.3” 1 15/06/01 30 0.5 0.5 X Río Puente Largo 16°51’52.6” 89°02’21” 2 15/06/01 32 0.48 0.175 Y La Democracia 17°21’53.9” 88°32’20.7” 1 16/06/01 29 0.22 0.22 Z Sand Hill 17°35’41.5” 88°21’40” 1 16/06/01 35 0.25 0.25 AA Dos Charcos 17°21’53.9” 88°32’20.7” 1 16/06/01 30 0.36 0.36 AB Caves Branch 17°08’53.2” 88°42’33” 1 16/06/01 28 0.67 0.67 collection located in El Colegio de la Frontera ence/absence) (Legendre and Legendre 2000) Sur, Chetumal Unit.
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